在MAC下安装mysql后无法设置密码

bogon:/ apple$ /usr/local/mysql/bin/mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

求大神帮忙解决,在线等.

http://blog.csdn.net/tsangyang/article/details/7861758